Release what you have, which works in Tiger. But then, add your new leopard only features for your next version, and don't look back. Although you may lose a

Release what you have, which works in Tiger. But then, add your new leopard only features for your next version, and don't look back. Although you may lose a little business in the short term, there's very little evidence to suggest you'll fail by going Leopard only. I can't think of a single mac shareware app that has failed because it was only available to the new OS. The kind of people who jump at Apple's latest OS release are the same kind of people who are going to download your application and tell all their friends about it.